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  1. Kudu
  2. KUDU-2246

Make "kudu tablet change_config move_replica" more reliable

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    Details

    • Type: Improvement
    • Status: Open
    • Priority: Major
    • Resolution: Unresolved
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: consensus, ops-tooling
    • Labels:
      None

      Description

      As part of KUDU-1097 we changed the replica move tool to use the new 3-4-3 re-replication scheme when it's enabled. In certain edge-case scenarios, such as when there is a replica failure in the middle of a move operation, the reliability of the tool may be reduced, and the node slated for removal may not be removed. This is especially true if the user hits ctrl+c and kills the tool before the movement process is complete in the context of a simultaneous failure.

      We can improve this by implementing leadership transfer (KUDU-2245) and having a leader gracefully step down when there is a suitable replacement and the leader is marked with the "replace=true" attribute in the Raft config.

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              • Assignee:
                Unassigned
                Reporter:
                mpercy Mike Percy
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                Dates

                • Created:
                  Updated: